Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-01-11
2011-01-11
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
Reexamination Certificate
active
07869488
ABSTRACT:
A method and apparatus for estimating a communication channel impulse response h(t) is disclosed. The method comprises the steps of generating a data sequence dihaving a constrained portion Cdiassociated with at least two codes w0, w1, wherein a correlation Acode(k) of the constrained portion Cdiwith one of the codes w0, w1is characterized by a maximum value at k=0 and less than maximum values at k≠0; generating a chip sequence cjhaving a chip period Tcas the data sequence dispread by a spreading sequence Siof length N; generating com(t)=co(t+mNTc) for m=0, 1, . . . , M by correlating a received signal r(t) with the spreading sequence Si, wherein the received signal r(t) comprises the chip sequence cjapplied to the communication channel; and generating an estimated communication channel impulse response ĥM(t) as a combination of com(t) and dmfor m=0, 1, . . . , M.
REFERENCES:
patent: 5623511 (1997-04-01), Bar-David et al.
patent: 5737327 (1998-04-01), Ling et al.
patent: 5901185 (1999-05-01), Hassan
patent: 6005886 (1999-12-01), Short
patent: 6608859 (2003-08-01), De et al.
patent: 6661857 (2003-12-01), Webster et al.
patent: 6680967 (2004-01-01), Westman
patent: 6721293 (2004-04-01), Komulainen et al.
patent: 6956893 (2005-10-01), Frank et al.
patent: 7177376 (2007-02-01), Atungsiri et al.
patent: 2003/0081656 (2003-05-01), Buehrer et al.
patent: 2004/0052306 (2004-03-01), Ibrahim et al.
patent: 0963071 (1999-12-01), None
patent: 1257077 (2002-11-01), None
patent: 2192094 (2002-10-01), None
patent: 0067389 (2000-11-01), None
patent: WO0067389 (2000-11-01), None
patent: WO0161902 (2001-08-01), None
patent: 0205442 (2002-01-01), None
Teng Joon Lim, “Bias in CDMA Channel estimates with the use of short spreading sequences” IEEE, vol. 1, Sep. 6, 2000, pp. 288-291.
International Search Report—PCT/US04/026349, International Searching Authority—European Patent Office, Dec. 29, 2004.
Written Opinion—PCT/US04/026349, International Searching Authority—European Patent Office, Dec. 29, 2004.
International Preliminary Report on Patentability—PCT/US04/026349, IPEA—US, Feb. 21, 2006.
Proakis, “Digital Communications,” 4th Edition, (Book), McGraw-Hill, Aug. 2000., pp. 660-703.
European Search Report—EP10157800—Berlin—Apr. 26, 2010 (020305).
Ahn Sam K
Beladi Sayed H.
Qualcomm Incorporated
Seo Howard E.
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